{
  "cveId": "CVE-2026-67411",
  "url": "https://patchblox.com/security/cve/CVE-2026-67411",
  "summary": "CVE-2026-67411 is fixed in rabbitmq-server on 1 platform by DEBIAN-CVE-2026-67411 (version 4.3.6-1), released October 10, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "RabbitMQ: Web MQTT with PROXY Protocol enabled: a loopback-only user permission bypass",
  "description": "RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3, native MQTT and MQTT over WebSocket behind a trusted PROXY Protocol frontend could lose the proxy-derived client address before the MQTT authentication path checked loopback_users, causing the frontend-to-broker address to be treated as loopback. An attacker who can reach the trusted frontend and has valid credentials for a loopback-restricted account can therefore bypass the source-address restriction; the issue does not bypass password authentication. This issue is fixed in versions 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3.",
  "published": "2026-09-25T17:17:13Z",
  "severity": "Moderate",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
  "cwe": "Incorrect Authorization",
  "epss": 0.00318,
  "epssPercentile": 0.2491,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67411",
  "fixes": [
    {
      "platform": "linux",
      "product": "rabbitmq-server",
      "release": "Debian 14",
      "fixedVersion": "4.3.6-1",
      "fix": "DEBIAN-CVE-2026-67411",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-67411",
      "released": "2026-10-10T22:48:57Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}